I'm used to using my left hand to play rhythmic parts and my right hand to play melodic lines (like, I assume, many other players).
What kind of approaches would you recommend to learn to swap these roles (i.e., play rhythmic parts with the right hand while playing melodic lines with the left one)? If that's unclear, here's a segment I can play if I cross hands, but that I'm unable to play the way it's shown (from 2:15 to 2:27):
(I'm right-handed, but I'm not sure it matters)